brake pressure regulator

under the heading of WHAT WERE THEY THINKING:
the lever on my brake pressure regulator is frozen.
this device adjusts rear brake balance based an rear suspension
loading.
dealer price is $404 !!!
sounds like a junkyard part to me.
we're talking about a simple friggin valve here...
Geez...while you're at it...call Keith Anderson and get a nice adjustable
brake bias valve for A LOT less!!
Royal